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Good Morning James.
If you have a contract with the contractor, I would certainly demand what you signed for on your contract.
Even though Ameristar is made by same MFR. it may have less features on it.
To answer your question, I NEVER put in a piece of equipment other than what I quote and contract for. Most of the time, I even put the model number of the equipment on the quote. I don't believe this is a common practice, but I have heard it done before.
Just following up to see how you made out. If you have any other questions, please feel free to contact me. If you could please rate the service you have received, so that I may close out the call.